Population structure, ecological segregation and reproduction in non‐anadromous Arctic charr, Salvelinus alpinus (L), in four unexploited lakes in the Canadian high Arctic
Land‐locked populations of Arctic charr in four lakes on Northern Ellesmere Island (80° N) were found to consist of two distinct sizes: ‘dwarf’ and ‘normal’ charr. Both groups attained sexual maturity but differed in appearance and habitat. The smaller fish, occupying the more marginal habitats, ret...
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crwiley:10.1111/j.1095-8649.1991.tb03098.x 2024-06-23T07:48:55+00:00 Population structure, ecological segregation and reproduction in non‐anadromous Arctic charr, Salvelinus alpinus (L), in four unexploited lakes in the Canadian high Arctic Parker, H. H. Johnson, L. 1991 http://dx.doi.org/10.1111/j.1095-8649.1991.tb03098.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1991.tb03098.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1991.tb03098.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 38, issue 1, page 123-147 ISSN 0022-1112 1095-8649 journal-article 1991 crwiley https://doi.org/10.1111/j.1095-8649.1991.tb03098.x 2024-06-11T04:42:12Z Land‐locked populations of Arctic charr in four lakes on Northern Ellesmere Island (80° N) were found to consist of two distinct sizes: ‘dwarf’ and ‘normal’ charr. Both groups attained sexual maturity but differed in appearance and habitat. The smaller fish, occupying the more marginal habitats, retained their parr‐markings; the larger group had the general characteristics of smolts, being more silvery and without parr‐marks. In their juvenile stages, the charr destined to attain the larger group were indistinguishable from members of the smaller group. Although fish in the larger group were capable of cannibalism, this was rarely observed. In general, the fish in the larger group were older than the smaller ones but great variation in size at a given age resulted in certain age classes containing representatives of both groups. The population structure varied considerably between lakes; a high proportion of ‘normal’ charr correlated well with a high growth rate in the first few years of development. It is postulated that the two groups live in dynamic equilibrium where the advantages of progenesis (retention of juvenile characters by adults) in the smaller type are traded against the larger proportion of the energy resources available to the larger type. The concept of heterochrony in an ecological setting is introduced. Article in Journal/Newspaper Arctic charr Arctic Ellesmere Island Salvelinus alpinus Wiley Online Library Arctic Ellesmere Island Four Lakes ENVELOPE(-126.826,-126.826,54.858,54.858) Journal of Fish Biology 38 1 123 147 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Land‐locked populations of Arctic charr in four lakes on Northern Ellesmere Island (80° N) were found to consist of two distinct sizes: ‘dwarf’ and ‘normal’ charr. Both groups attained sexual maturity but differed in appearance and habitat. The smaller fish, occupying the more marginal habitats, retained their parr‐markings; the larger group had the general characteristics of smolts, being more silvery and without parr‐marks. In their juvenile stages, the charr destined to attain the larger group were indistinguishable from members of the smaller group. Although fish in the larger group were capable of cannibalism, this was rarely observed. In general, the fish in the larger group were older than the smaller ones but great variation in size at a given age resulted in certain age classes containing representatives of both groups. The population structure varied considerably between lakes; a high proportion of ‘normal’ charr correlated well with a high growth rate in the first few years of development. It is postulated that the two groups live in dynamic equilibrium where the advantages of progenesis (retention of juvenile characters by adults) in the smaller type are traded against the larger proportion of the energy resources available to the larger type. The concept of heterochrony in an ecological setting is introduced. |
format |
Article in Journal/Newspaper |
author |
Parker, H. H. Johnson, L. |
spellingShingle |
Parker, H. H. Johnson, L. Population structure, ecological segregation and reproduction in non‐anadromous Arctic charr, Salvelinus alpinus (L), in four unexploited lakes in the Canadian high Arctic |
author_facet |
Parker, H. H. Johnson, L. |
author_sort |
Parker, H. H. |
title |
Population structure, ecological segregation and reproduction in non‐anadromous Arctic charr, Salvelinus alpinus (L), in four unexploited lakes in the Canadian high Arctic |
title_short |
Population structure, ecological segregation and reproduction in non‐anadromous Arctic charr, Salvelinus alpinus (L), in four unexploited lakes in the Canadian high Arctic |
title_full |
Population structure, ecological segregation and reproduction in non‐anadromous Arctic charr, Salvelinus alpinus (L), in four unexploited lakes in the Canadian high Arctic |
title_fullStr |
Population structure, ecological segregation and reproduction in non‐anadromous Arctic charr, Salvelinus alpinus (L), in four unexploited lakes in the Canadian high Arctic |
title_full_unstemmed |
Population structure, ecological segregation and reproduction in non‐anadromous Arctic charr, Salvelinus alpinus (L), in four unexploited lakes in the Canadian high Arctic |
title_sort |
population structure, ecological segregation and reproduction in non‐anadromous arctic charr, salvelinus alpinus (l), in four unexploited lakes in the canadian high arctic |
publisher |
Wiley |
publishDate |
1991 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1991.tb03098.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1991.tb03098.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1991.tb03098.x |
long_lat |
ENVELOPE(-126.826,-126.826,54.858,54.858) |
geographic |
Arctic Ellesmere Island Four Lakes |
geographic_facet |
Arctic Ellesmere Island Four Lakes |
genre |
Arctic charr Arctic Ellesmere Island Salvelinus alpinus |
genre_facet |
Arctic charr Arctic Ellesmere Island Salvelinus alpinus |
op_source |
Journal of Fish Biology volume 38, issue 1, page 123-147 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1991.tb03098.x |
container_title |
Journal of Fish Biology |
container_volume |
38 |
container_issue |
1 |
container_start_page |
123 |
op_container_end_page |
147 |
_version_ |
1802639226293977088 |